The Productivity of Fish Food in Oneida Lake 55 



Description of the Habitats and Their Gross Vegetation 



The territory examined may be divided into four divisions : 

 I, Dunham Island and vicinity; 2, Lower South Bay; 3, south 

 shore of the lake east of Norcross Point; and 4, certain locali- 

 ties at a distance from the Lower South Bay region. The latter 

 are not included in the quantitative tables. The first three 

 divisions are plotted on the large map (-fig. i) which should 

 be consulted in connection with the habitat descriptions. The 

 animal life and the algee of each habitat are listed in the tables 

 accompanying the chapter on Composition of the Bottom 

 Fauna. These have been rearranged, averaged, and listed 

 under the heading of the bottom material. Only living animals 

 have been considered in preparing the quantitative tables. In 

 the tables accompanying this chapter the higher plants are 

 listed under each habitat together with the physical informa- 

 tion necessary for an understanding of the environments. The 

 methods of collecting the material are described in the Intro- 

 ductory Chapter. 



I. Dunham Island 



Dunham Island is about seven-eighths of a mile northeast 

 of Norcross Point. It is three-eighths of a mile long and 

 one-eighth of a mile wide and is pointed rather sharply at 

 both ends. It is well wooded and the land rises 20 feet above 

 the water surface in two places (380- and 390-foot contours, 

 the surface of the lake being 369 feet above tide). On the 

 west and south sides the water rapidly deepens to ten feet but 

 on the north and east sides the water is shallow, ranging from 

 one to five feet. Between Dunham and Frenchman Islands 

 there is a sandy shoal, in most places less than five feet in 

 depth, which is inhabited by a greater average number of 

 animals than any region examined in the lake. Collections 

 were made only at the west end of Dunham Island (fig. 5). 

 The water here varies from one to five feet in depth and the 

 bottom is of sand. The edge of the shore for a width of five 

 or six feet is thickly strewn with boulders which are covered 



